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Coherent optical OFDM: theory and design

W. Shieh, H. Bao, and Y. Tang

W. Shieh, H. Bao, and Y. Tang

ARC Special Research Centre for Ultra-Broadband Information Networks and National ICT Australia Department of Electrical and Electronic Engineering The University of Melbourne, Melbourne, VIC 3010, Australia

Abstract

Coherent optical OFDM (CO-OFDM) has recently been proposed and the proof-of-concept transmission experiments have shown its extreme robustness against chromatic dispersion and polarization mode dispersion. In this paper, we first review the theoretical fundamentals for CO-OFDM and its channel model in a 2×2 MIMO-OFDM representation. We then present various design choices for CO-OFDM systems and perform the nonlinearity analysis for RF-to-optical up-converter. We also show the receiver-based digital signal processing to mitigate self-phase-modulation (SPM) and Gordon-Mollenauer phase noise, which is equivalent to the mid-span phase conjugation.

(a). The Q factor as a function of the launch power with varying number of steps used in split-step Fourier method in nonlinear phase noise mitigation, and (b) the Q factor improvement as a result of nonlinear noise phase noise mitigation.